scsi: pm8001: Mark symbols static where possible

We get 2 warnings when building kernel with W=1:
drivers/scsi/pm8001/pm8001_sas.c:530:23: warning: no previous prototype for 'pm8001_alloc_dev' [-Wmissing-prototypes]
drivers/scsi/pm8001/pm8001_hwi.c:4495:5: warning: no previous prototype for 'pm8001_chip_phy_stop_req' [-Wmissing-prototypes]

In fact, these functions are only used in the file in which they are
declared and don't need a declaration, but can be made static.  So this
patch marks these functions with 'static'.
Signed-off-by: Baoyou Xie <baoyou.xie@linaro.org>
Acked-by: Lindar Liu <lindar_liu@usish.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/pm8001/pm8001_hwi.c

@@ -4492,7 +4492,7 @@ pm8001_chip_phy_start_req(struct pm8001_hba_info *pm8001_ha, u8 phy_id)
  * @num: the inbound queue number
  * @phy_id: the phy id which we wanted to start up.
  */
-int pm8001_chip_phy_stop_req(struct pm8001_hba_info *pm8001_ha,
+static int pm8001_chip_phy_stop_req(struct pm8001_hba_info *pm8001_ha,
 				    u8 phy_id)
 {
 	struct phy_stop_req payload;

drivers/scsi/pm8001/pm8001_sas.c

@@ -527,7 +527,7 @@ void pm8001_ccb_task_free(struct pm8001_hba_info *pm8001_ha,
   * pm8001_alloc_dev - find a empty pm8001_device
   * @pm8001_ha: our hba card information
   */
-struct pm8001_device *pm8001_alloc_dev(struct pm8001_hba_info *pm8001_ha)
+static struct pm8001_device *pm8001_alloc_dev(struct pm8001_hba_info *pm8001_ha)
 {
 	u32 dev;
 	for (dev = 0; dev < PM8001_MAX_DEVICES; dev++) {